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JBL Marine MA6004

320W 4-Channel Marine Amplifier

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List price $169.95

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$109.95

with warranty

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Get FAST answers from customers ASK a Question See questions answers

  • Marine Series 4-Channel Class AB Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 60 watts x 4 chan.
    • 2 ohms: 80 watts x 4 chan.
    • Bridged, 4 ohms: 160 watts x 2 chan.
    • Total RMS: 320 watts
  • Dynamic power, 2 ohms: 145 watts
  • MOSFET power supply
  • LED power and protection indicators
  • Tuned Bass EQ (0-6 dB bass boost)
  • Preamp RCA outputs
  • Thermal, voltage, and short protection circuitry
  • Heavy duty aluminum alloy heatsink
  • Gold-plated RCA level inputs
  • Gold-plated screw terminals
  • Variable high-pass filter (32-320 Hz)
  • Variable low-pass filter (32-320 Hz)
  • CEA-2006 compliant amplifier
  • Frequency response: 10-27000 Hz
  • Dimensions: 13-1/4"L x 10-1/4"W x 2-3/16"H
  • 8-gauge power and ground leads recommended. Contact us for information regarding a discount on a select amplifier kit when purchased together.
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

Power Specifications - Full Range Channels

RMS Power @ 4 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 4 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

60 watts x 4 channels
RMS Power @ 2 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 2 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

80 watts x 4 channels
RMS Power @ 1 ohm

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 1 ohm, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

Not Stable
Bridged RMS Power

Bridging refers to combining two channels on an amplifier to create one channel with double the voltage and an increased power output. A 2-channel amplifier will bridge down to 1-channel and a 4-channel amplifier can bridge to create 2-channels. An amplifier is most commonly bridged to drive a subwoofer.

Remember, once you bridge two channels down to one its final impedance will be 4 ohms unless otherwise specified. This rating lists the RMS power created once an amplifier is bridged.

160 watts x 2 channels
Peak Power Output
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison.

Not Specified

Amplifier Specifications

Marine Certified
Marine certified means that the unit has been designed and manufactured with a marine use in mind. It will withstand the harsh conditions that come from marine use. Generally, they are treated against UV rays and treated with special protective coatings.
Yes
Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.

AB
Number of Channels
Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.
4
Total RMS Power Output
Total RMS power is measured by multiplying RMS power per channel by the number of channels, and is calculated at the lowest level of operating impedance.

RMS power is the amount of continuous power, measured in watts, that an amplifier produces is called RMS power. The higher the RMS figure, the louder and cleaner your music sounds.

The RMS output figure is much more accurate than the peak rating when comparing products.

320 watts
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
4 AWG
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
2 ohms
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
4 ohms
THD at Rated RMS Power
The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
1%
Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
No
Preamp Outputs
Many amplifiers are equipped with RCA preamp outputs which pass the original music signal from the source to additional amplifiers. This is known as daisy chaining because the source connects to the first amp, and the first amp connects to the second amp, etc. The advantage to daisy chaining is you only need one 2-channel RCA cable to transfer the signal from the head-unit to the amplifier, and then one additional cable for each amp being daisy chained.
1 pair
Built-in Crossover

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

Low-pass (LP)
High-pass (HP)
Full (AP)
High-Pass Crossover Frequency
The high-pass crossover frequency can be a fixed crossover point or a variable crossover range. A variable high-pass crossover allows you to select a specific crossover point which allows frequencies above the set crossover point to pass, while making frequencies below the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

32 - 320 Hz
Low-Pass Crossover Frequency
The low-pass crossover frequency is typically used for subwoofers. It can be a fixed crossover point or a variable crossover range. A variable low-pass crossover allows you to select a specific crossover point which allows frequencies below the set crossover point to pass, while making frequencies above the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

32 - 320 Hz
Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
80 dB
Bass Boost
The objective of the bass boost is to get more kick out of your subwoofer. It is a circuit that emphasizes the lower frequencies at a given point. The bass boost should always be set first before setting the gain. This feature is known for destroying subwoofers and is commonly used incorrectly, so be cautious.
0 - 6 dB
Bass/Gain Remote
If the amp comes with a bass/gain remote you will be able to control the level of your bass from your dashboard. Typically bass remotes also include a 16-20 ft. wire for installation.
No
Fan Cooled
A great feature to have if an amp generates a large amount of heat. Cooling fans can help regulate the temperature to prevent the amp from overheating (burning).
No
Fuse Rating
The amperage and the number of fuse(s) an amp requires.
25A x 2 
CEA-2006 Compliant
Amplifiers that have been tested to meet specific standards. When a car amplifier meets these standards, you can be sure that it will be able to produce the amount of power specified by the official CEA-2006 rating. Usually, these rating consist of the following items:
  • RMS Power
  • Signal-to-Noise Ratio

This rating applies to both external car amplifiers, as well as the amplifiers inside of in-dash stereos.

Yes

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
79%
4 Star
21%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
4.9
Features
4.8
Design
4.8
Usability
4.9
bcg

crowley tx

Overall
Durability
Value
Features
Design
Usability
good amp

August 31, 2014

Put it in my girlfriends jeep sounds super nice and havent had any problems

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Marty

Schenectady,ny

Overall
Durability
Value
Features
Design
Usability
Good for the money

August 6, 2014

Good deal for the money. Use this amp with better speakers than factory and it will sound great.

0 of 0 found this helpful

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T. J.

Pearland, TX

Overall
Durability
Value
Features
Design
Usability
Fine piece of equipment

June 20, 2014

Installation was easy, termination of wires simple. Pleased with the quality of sound.

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Superdutymax

Canada

Overall
Durability
Value
Features
Design
Usability
Great power!!

June 6, 2014

AAA PERFECT SERVICE , support by phone very easy and great shipiing

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Augie

Tavernier, FL

Overall
Durability
Value
Features
Design
Usability
Great Price and good product

December 2, 2013

Have only had the amp for a month but it works great so far and was easy to set up.

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Glen

Hannibal, MO

Overall
Durability
Value
Features
Design
Usability
Great Amplifier, needs cooling fan.

September 17, 2013

I really like the way the amp sounds and it has very good water resistance, but it tends to overheat if pushed to it's limit. I was able to keep it from shutting down due to heat by putting a computer fan running across the heatsink.

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Dan

Bloomington,IL

Overall
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Value
Features
Design
Usability
Nice amp at Great price!

December 12, 2012

Bought this amp for my bayliner boat, using it to drive 2 6.5 jbl and 2 6x9 jbl speakers and it sounds fantastic.

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Rick

Livingston, TN

Overall
Durability
Value
Features
Design
Usability
Great Amp

December 5, 2012

I really like the looks and sound of this amp. It blends in well with boat interior. It really made my speakers come alive. I have always had good luck with JBL.

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Jeremiah

West Palm Beach, FL

Overall
Durability
Value
Features
Design
Usability
Great amp

September 10, 2012

Great amp with little power draw. Have this running a bazooka 10" tube and 4-6.5 marine boss speakers and can play for hours on my two batteries and not have to worry about starting my yammy 250.

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T-REY

BENTON,LA

Overall
Durability
Value
Features
Design
Usability
JBL BULLET PROOF AMP

November 16, 2011

I installed the amp on a polaris rzr, pushing a 10" sup and 2 6" mids, it sounds great and the best part is when it gets muddy i just spray it of. I'm not a stereo man but due to the sound and especialy the durability i would highly reccomend.

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DEAN

Vero Beach, FL

Overall
Durability
Value
Features
Design
Usability
great amp for the price !

October 13, 2011

I have used this amp for about 6 months now, it sounds great!

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Bernie

Omaha, Nebraska

Overall
Durability
Value
Features
Design
Usability
Tower Speaker Amp

August 10, 2011

I installed this amp for my 6.5" polk tower speakers. I was a little worried that I'd have to run it in the bridged mode to get enough power to hear while wakeboarding but they rock even at 60 feet behind the boat going 20 MPH. I plan to use the rear channel for a subwoofer now that I know I only need the front channel for the tower speakers. I can't say much about durability but so far so good. FYI I installed a subwoofer volume control in the RCA cables to the amp which comes in real handy for cranking up the tower speakers or turning them down to match the in boat speakers when cruising.

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Jarrett

Brighton, MI

Overall
Durability
Value
Features
Design
Usability
Awesome sound for a good price

October 15, 2010

I would recommend this Amp to someone interested in a nice "kick" to their current stereo set up. I use this JBL with a Sony Marine CDX M60ui for the perfect combination of power and clarity. The JBL Amp works perfect to supply excellent power whether you are listening while you are in the boat or if you need a little extra power because you are outside the boat or a short distance away. This unit rocks the docks and shakes the lakes.

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Mike

cheyenne, WY

Overall
Durability
Value
Features
Design
Usability
shopped the net best deal

August 1, 2010

this amp has worked perfect in my boat. i drive two tower speakers and two six by nines in the boat it rocks

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johnny

Atlanta, GA

Overall
Durability
Value
Features
Design
Usability
Awesome Quality

April 13, 2010

Sounds Awesome! Looks nice when on! The quality is very nice! New found respect for the JBL amps!

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JZ

savannah, GA

Overall
Durability
Value
Features
Design
Usability
Good value

January 10, 2010

Installed this product in my boat. Sounds strong and clear driving four MTX TM7702 speakers. So far this amp does the trick and was fairly easy to install. NO annoying pops or buzz from the amp when you fire it up. Time will tell how it holds up as with any amp in a marine environment. Great value.

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Richard

Hampstead, MD

Overall
Durability
Value
Features
Design
Usability
Good Product

September 22, 2009

Just install on my new boat looks great and an easy install

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chris

Gilbert, AZ

Overall
Durability
Value
Features
Design
Usability
"JBL IS KING OF LIVE MUSIC, WHY NOT MOBILE AUDIO TOO"

September 8, 2009

This amp rocks! You just can't beat JBL quality, I have this running 4 Kicker 6x9's and it sounds better than any other amp and speaker combo I've ever heard in a boat. I've had a lot of boats in my time, I fix them up and sell them, with JL Audio, Polk, and Sony and none of these touch my JBL amps and subs and Kicker highs set up!

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Mike

Phoenix,AZ

Overall
Durability
Value
Features
Design
Usability
great marine amp

August 26, 2009

hooked this amp up in the boat and played nice and loud and clear. really sounded great running 4, 6 1/2. polks.

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Accessory Tools and Products

Accessories added

NVX XKIT42

Complete 4 Gauge Amp Wiring Kit with RCA Interconnect Cables and Speaker Wire!

Your Price $69.99

The InstallBay AK4 by Metra

4 Gauge Amplifier Installation Kit with RCA Interconnect Cable

Your Price $24.99

Kicker K-Series RCA Interconnect Cable

19 ft. of 4-Channel RCA cable with dual twisted-pair conductors, hyper-flex technology, and gold plated contacts for maximum signal transfer!

Your Price $29.95

Kicker 4-Channel RCA Audio Interconnect Cable

4 Meters (13 ft.) 4-Channel K-Series RCA Audio Interconnect Cable

Your Price $19.95

StreetWires ZN7 RCA Interconnect Cable

16.4 ft. of 4-Channel RCA Cable with hyper twist construction, oxygen free copper, and precision machined tips.

Your Price $59.99

StreetWires SCP1215BL - 12 AWG Speaker Wire

12 Gauge Wire - 15 ft. of Speaker Cable with Twisted Construction

Your Price $24.95

StreetWires FB4

4 AWG / 4 Gauge Firewall Bushing

Your Price $6.95

Car/Marine Audio Installation Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $14.99

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• e2 400W Single Amplifier Wiring Kit
• 6.5mm Power/Ground (Equivalent in Strands to Most Other "8 Gauge" Kits)
• 17 ft. Twisted Hex RCA Interconnect Cables
• 17 ft. Power and Ground Cables

Your Price $20.99

Browse 1 question and 3 answers
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Why did you choose this?
Sonic Electronix Store
Great Value on a quality product in a weather resistant marine design. Better cross over settings and also is bridgeable.
JAMES W on Nov 7, 2014
Great product fit my needs at a great price.
Taylor M on Aug 2, 2014
I have a 100% JBL solution on our boat. I am very happy with the provider and want to continue to keep with JBL.
D roger S on Oct 27, 2014

Product Summary

Manufacturer

Model Number

MA6004

UPC

050036119108

Weight

8.00lbs

Internal SKU

ma6004

Internal Product ID

12253

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: JBL Marine MA6004